EVO X : Intake Testing
A few posts ago we showed some pictures of our EVO X and various parts under development. With the engine finally fully broken in now, we were able to do some testing and finalize the design of a few parts including our SF Intake.
Below is a dyno graph of our results from the SF Intake testing. Most of the gains come by way of leaning out the A/F mixture. Even though we maintained the exact same MAF housing size as stock, the change in air flow is causing the car to run leaner. This has been the same as reported by nearly everyone else testing intakes on their EVO X. Fortunately, it’s not unsafe. In fact, the stock EVO X runs so rich (black smoke out the tailpipe rich) that it causes our wide-band lambda sensor to go off the chart.
This part has now moved into production and should be available for purchase this spring!
For raw dyno graphs including boost and A/F ratio, click on the image below:
Are you suggesting that using the SF Intake you are leaning out the A/F mixture which results in the gains observed. Unless you have developed a evo X specific SF Intake wouldn’t you lean out the A/F mixture on other aplications like the WRX?
Or is the leaning out a result ECU variable changes?
I was interested because I was thinking about puchasing a SF intake for the sound while retaining the same sensor readings.